Malicious PDF — malware analysis report

Static analysis result for SHA-256 2622be6d692ecfea…

MALICIOUS

PDF

76.9 KB Created: 2021-06-27 09:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f846e89ea260ad5e7c0b67fb79b19a1c SHA-1: eb7d34a763ff3b52dd512bdfd0f61e6a9e4d0824 SHA-256: 2622be6d692ecfeae267127a78bf6ba754fefafd981d98c97f80378412ee9874
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091718042cdc---vefazubilujabedosujo.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/j5sja22e5qh4okkugtadschig0/bajakexek.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uuhhbmd3safn6gpcl28mtrv2hk/xuwabijofofopelowika.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/10411873767.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/s2obf5r0bqctihpodtnrd41bbo/74255272490.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e155e7dde---pezagize.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b13061562eabd0ce8c3230552ad8e2c7/90986253291.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/15af005bde440af1690d0382792caa0e/manibibik.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/876d24faf936ddb75442be102b78abd5/lisakukamolur.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50a26cd0a4---79977413745.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c7317766---litokise.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57cca0395---49093167335.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/89b7808762c18c38c3f6e79e039e49a3/20659325023.pdf
    • http://asiadomainstore.com/userfiles/file/26282689031.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fd6c8a5d0891189d57b765e64c4ac6f4/kofugemunufuzepuweji.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e21030d8ab---15234010058.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160726edf46c11---27561889395.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654dd1e93a---gubuvefumularevano.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090b54fd7d69---86525960178.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/imeog584hd69ug0fth45ctf1jo/57772526216.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lnmt724o4lfsdvl8f8tltm26g7/zigamugebereduvedifu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=off+to+a+flying+start
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cad3.bin
0e61fbea65984e32f15f220c014e829ea4add547705c2e4dcbf491784c878448
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 16812 bytes
font_01_sfnt_off0000f6cd.bin
23b0ed42fc81dee0a267ebea593bc6af421ae7fd4582519173f4db87cddf6fef
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 10396 bytes
font_02_sfnt_off00010e7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 16792 bytes